/*
*  Copyright (c) 2001 Sun Microsystems, Inc.  All rights
*  reserved.
*
*  Redistribution and use in source and binary forms, with or without
*  modification, are permitted provided that the following conditions
*  are met:
*
*  1. Redistributions of source code must retain the above copyright
*  notice, this list of conditions and the following disclaimer.
*
*  2. Redistributions in binary form must reproduce the above copyright
*  notice, this list of conditions and the following disclaimer in
*  the documentation and/or other materials provided with the
*  distribution.
*
*  3. The end-user documentation included with the redistribution,
*  if any, must include the following acknowledgment:
*  "This product includes software developed by the
*  Sun Microsystems, Inc. for Project JXTA."
*  Alternately, this acknowledgment may appear in the software itself,
*  if and wherever such third-party acknowledgments normally appear.
*
*  4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA"
*  must not be used to endorse or promote products derived from this
*  software without prior written permission. For written
*  permission, please contact Project JXTA at http://www.jxta.org.
*
*  5. Products derived from this software may not be called "JXTA",
*  nor may "JXTA" appear in their name, without prior written
*  permission of Sun.
*
*  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
*  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
*  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
*  DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
*  ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
*  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
*  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
*  USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
*  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
*  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
*  OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
*  SUCH DAMAGE.
*  ====================================================================
*
*  This software consists of voluntary contributions made by many
*  individuals on behalf of Project JXTA.  For more
*  information on Project JXTA, please see
*  <http://www.jxta.org/>.
*
*  This license is based on the BSD license adopted by the Apache Foundation.
*
*  $Id: Status.java,v 1.2 2006/07/12 21:24:30 nano Exp $
*/

package net.jxta.myjxta.util;

import javax.management.*;

/**
 * A "status" message bean.
 *
 * @author james todd [gonzo at jxta dot org]
 */

public final class Status
implements StatusMBean, NotificationEmitter {

    private static final String NOTIFICATION_TYPE = "net.jxta.myjxta.status";
    private static Status instance = null;
    private static final NotificationBroadcasterSupport broadcaster =
        new NotificationBroadcasterSupport();

    private long sequence = 0;
    private boolean start = false;

    public synchronized static Status getInstance() {
        if (instance == null) {
            instance = new Status();
        }

        return instance;
    }

    public long getNumberOfStatusEvents() {
        return this.sequence;
    }

    public void statusEvent(String status) {
        if (this.start) {
            broadcaster.sendNotification(new Notification(NOTIFICATION_TYPE,
                this, ++this.sequence));
        }
    }

    public synchronized void start() {
      this.start = true;
    }

    public synchronized void stop() {
      this.start = false;
    }

    public void addNotificationListener(NotificationListener listener,
        NotificationFilter filter, Object handback)
    throws IllegalArgumentException {
        Status.broadcaster.addNotificationListener(listener, filter, handback);
    }

    public void removeNotificationListener(NotificationListener listener)
    throws ListenerNotFoundException {
        Status.broadcaster.removeNotificationListener(listener);
    }

    public void removeNotificationListener(NotificationListener listener,
        NotificationFilter filter, Object handback)
    throws ListenerNotFoundException {
        Status.broadcaster.removeNotificationListener(listener, filter,
            handback);
    }

    public MBeanNotificationInfo[] getNotificationInfo() {
        return new MBeanNotificationInfo[] {
            new MBeanNotificationInfo(new String[] { NOTIFICATION_TYPE },
            javax.management.Notification.class.getName(),
	    "MyJXTA status nofication")};
    }
}
